Cisco ASA failover - Primary unit reboots on activation

We have an Active/Standby ASA 5540 failover cluster. Few months back, the secondary unit became active automatically while the primary went into 'Standby Ready' mode. Now, whenever we try to make the primary Active either by giving the command "failover active" on primary or "no failover active" on secondary, the primary automatically and immediately reboots. The logging on secondary unit shows the following messages:

The interface GigabitEthernet0/3 is used for LAN failover in both the firewalls. The failover interfaces are connected to a switch. For troubleshooting, we also connected the two interfaces using a cross over cable, it didnt work and the same issue was faced again. Following is the LAN failover configuration on the two units:

Is the management interface unused?
Yes, the management interface is not being used.

failover replication tcp?? This isnt a command in Cisco ASA. Either we can use "failover replication http" or "no failover replication http". The only difference between the two is that in case of later the http connection table from the active unit will not be transferred to the standby unit.

We have found a following link for best practices on configuring Cisco ASA:

"no failover replication http" did it for us. The primary unit is now active. It seemed to be a problem with poll and hold timers. The short timers probably do not allow the http replication while failing over. We believe that adjusting timers might also have helped.

For the second problem posted above: "Lost Failover communications with mate on interface outside/inside/DMZ-NHS" we have found a good explanation in "Configuring Failover via Cisco ASDM" by Bob Eckhoff. Can be downloaded from:

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